CVE-2026-50889Public exploitNetwork attack vector

HTTP service crash via malformed refresh-token header

Published Jun 15, 2026 · Updated Jun 15, 2026

Input handling in LLDAP 0.6.2 allows remote attackers to crash its HTTP service through a malformed refresh-token header. The get_refresh_token() helper in server/src/auth_service.rs calls HeaderValue::to_str().unwrap() on attacker-controlled non-ASCII header bytes, causing a panic instead of an authentication error. Unauthenticated access to the refresh or logout route is sufficient, and repeated requests can keep the default single-worker HTTP interface unavailable.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input handling in LLDAP 0.6.2 allows remote attackers to crash its HTTP service through a malformed refresh-token header. The get_refresh_token() helper in server/src/auth_service.rs calls HeaderValue::to_str().unwrap() on attacker-controlled non-ASCII header bytes, causing a panic instead of an authentication error. Unauthenticated access to the refresh or logout route is sufficient, and repeated requests can keep the default single-worker HTTP interface unavailable.

The record

CVE
CVE-2026-50889
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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